RT Journal Article SR Electronic T1 THE EFFECT OF THE DURATION OF STIMULUS ON THRESHOLD MEASUREMENTS IN THE DARK ADAPTED EYE JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 611 OP 617 DO 10.1136/bjo.28.12.611 VO 28 IS 12 A1 Simon Yudkin YR 1944 UL http://bjo.bmj.com/content/28/12/611.abstract AB